The area of interest in this study is the current ripple the battery sees as part of the EV drive train. Current research is focussing on using converters in different topologies to reduce the battery peak demand to reduce rate capacity effect. This study describes the effects the choice of topology can have on the battery current ripple. Any ripple as seen by the battery increases losses and temperature which results in a reduced capacity and battery life span. Therefore it is important to be able to control the size of the ripple and its frequency. The research presented in this study analyses two topologies popular in EV drive trains and shows a clear advantage in terms of battery current ripple reduction of parallel topology over the cascaded topology. The method of simulation, the simulation results and the conclusions are presented and discussed in this study.
Aims: To investigate the viability of using second life electric vehicle batteries as 'buffer packs' for localized, in home storage of renewable energy. To investigate the potential value of such energy storage in terms of reducing energy bills. To investigate the effect, if any, of social group on energy demand patterns and the subsequent effect on buffer packs. Methodology: Energy data was collected from 15 households and a representative daily demand pattern was formed from each. The availability of solar power was calculated based on standard assumptions regarding UK household installations. The flow of energy between the supply grid, renewable sources (i.e. solar panels) and a 10kWh battery storage system (the 'buffer pack') were simulated on a minute by minute basis allowing the savings in power drawn from the grid to be calculated.
Results:The simulation has indicated that the use of buffer packs has the potential to greatly increase the utilization of locally generated renewable energy. In some cases the stored energy removed the need to draw any power from the grid. The value of energy storage of this type has been estimated at approximately £250. Conclusion: Buffer packs have substantial potential to increase the degree of utilization of renewable energy sources. However the financial viability of such systems remains questionable, even when utilizing second-life electric vehicle batteries. Further work is
The paper describes some simple modelling to investigate whether there are potential benefits to incorporating a geared transmission in electric vehicle driveline. The overall conclusion is that considerable benefits in energy consumption are available if a continuously variable gearbox system is incorporated; performance improvements of 6 to 19.2% are predicted over a range of European, USA and Japanese driving cycles. Furthermore, the use of a much simpler, two speed gearbox an improve performance significantly — by for example 9.2% over the NEDC cycle — although similar improvements are not predicted over other driving cycles. Overall, the results suggest not only that direct benefits in terms of energy reductions are obtainable, but also that significant reductions in motor and driveline sizing may be an alternative approach to exploiting the introduction of a transmission system.
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